1. Guangdong Peripheral Nerve Tissue Engineering and Technology Research Center, Department of Orthopedic and Microsurgery, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510080, China
2. Translational Tissue Engineering Center, and Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, Maryland 21287, United States
3. Institute for NanoBioTechnology, and Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United States